ACR-104 Final

Refrigerant in the evaporator

• changes from vapor to liquid.

• changes from liquid to vapor.

• stays in the vapor state.

• stays in the liquid state.

A low evaporator superheat indicates

• undercharge.

• system restriction.

• overcharge.

• dirt buildup.

When an evaporator experiences a heat-load increase, the suction pressure

• remains constant.

• decreases.

• varies up and down.

• increases.

A medium-temperature refrigeration box operates within what temperature range?

• 28°F to 40°F

• 40°F to 60°F

• 0°F to 220°F

• 0°F to 50°F

Air-cooled condensers are much more efficient than water-cooled condensers.

• True

• False

What would be considered a higher-than-normal temperature for a discharge gas line on a reciprocating compressor?

• 190°F

• 215°F

• 250°F

• All of the above

Which compressor type uses pistons to compress the gas?

• Scroll

• Reciprocating

• Rotary

• Screw

Which compressor type uses tapered, machined gear components to trap the gas for compression?

• Scroll

• Reciprocating

• Rotary

• Screw

What lubricates the refrigeration compressor?

• Refrigerant

• Moisture

• Desiccants

• Oil

A compressor can compress a liquid.

• True

• False